Alert archive / Nebraska / Tornado Watches in 2019

Tornado Watch 411

June 20, 20194 states

The Storm Prediction Center issued this tornado watch at Jun 20, 2019, 4:04 PM MDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 20, 2019, 4:04 PM MDT (22:04 UTC)
Expired
Jun 20, 2019, 9:49 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 49 counties

Cheyenne County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Graham County, KS, Logan County, KS, Norton County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Goshen County, WY, Laramie County, WY, Niobrara County, WY

The radar

The North Platte radar (KLNX), 175 km from the middle of the area, began a volume at 22:03 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
60%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 20, 4:52 PM MDTTornado WarningCYSBox Butte, Dawes, Sioux23 min
Jun 20, 4:54 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill, Scotts Bluff, Sioux51 min
Jun 20, 4:56 PM MDTSevere Thunderstorm WarningBOUAdams, Washington49 min
Jun 20, 5:13 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert, Lincoln, Washington32 min
Jun 20, 5:13 PM MDTSevere Thunderstorm WarningCYSBox Butte, Dawes, Sioux36 min
Jun 20, 5:13 PM MDTSevere Thunderstorm WarningCYSConverse, Goshen, Niobrara, Platte47 min
Jun 20, 5:35 PM MDTSevere Thunderstorm WarningCYSBox Butte40 min
Jun 20, 6:21 PM MDTSevere Thunderstorm WarningBOUWashington24 min
Jun 20, 6:43 PM MDTSevere Thunderstorm WarningBOUWashington32 min
Jun 20, 6:57 PM MDTSevere Thunderstorm WarningGLDYuma48 min
Jun 20, 6:58 PM MDTSevere Thunderstorm WarningCYSDawes, Sioux47 min
Jun 20, 7:18 PM MDTSevere Thunderstorm WarningGLDYuma26 min
Jun 20, 7:27 PM MDTSevere Thunderstorm WarningCYSDawes, Sioux33 min
Jun 20, 7:37 PM MDTSevere Thunderstorm WarningGLDYuma38 min
Jun 20, 8:25 PM MDTSevere Thunderstorm WarningLBFSheridan65 min
Jun 20, 8:27 PM MDTSevere Thunderstorm WarningGLDCheyenne, Rawlins21 min
Jun 20, 9:09 PM MDTSevere Thunderstorm WarningLBFCherry, Sheridan66 min
Jun 20, 9:39 PM MDTSevere Thunderstorm WarningGLDDecatur, Norton, Rawlins, Sheridan66 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.1 hours before the alert went out and 176 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2019-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2019-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2431 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
260 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 2:51 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Baca, Bent, Boulder, Broomfield and 20 more114 min
Jun 19, 7:16 PM MDTMesoscale DiscussionSPCBlaine, Boyd, Brown, Custer, Garfield, Holt and 4 more89 min
Jun 19, 8:02 PM MDTMesoscale DiscussionSPCBox Butte, Dawes, Sheridan, Sioux118 min
Jun 20, 8:53 AM MDTMesoscale DiscussionSPCAntelope, Boone, Burt, Butler, Cass, Cedar and 30 more2 hr

Nearby

Tornado Watches in Nebraska, 2019Tornado Watches in Kansas, 2019Tornado Watches in Colorado, 2019Every tornado watch in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.